Improve the heuristic for detecting i2c devices. On the x1e some of the

Improve the heuristic for detecting i2c devices.  On the x1e some of the
USB controllers have an I2cSerialBusV2() (possibly defining a connection
to some sort of eUSB2 to USB2 redriver chip) but are not i2c devices
themselves.  So check if a device has MMIO resources and assume it isn't
a proper i2c device if it has those.  Makes the Type-A ports on my
vivobook work in acpi mode.

ok patrick@, mlarkin@